Grinding and characterization of natural Phosphate for direct application
2010
Saja, Khadija | Ouammou, Mohamed | Benezet, Jean-Charles | Le Cadre, Edith | Albizane, Abderrahmane | Ecologie Fonctionnelle et Biogéochimie des Sols (Eco&Sols) ; Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Ecole Nationale Supérieure Agronomique de Montpellier (ENSA M) | Université Hassan II [Casablanca] (UH2MC) | IMT - MINES ALES (IMT - MINES ALES) ; Institut Mines-Télécom [Paris] (IMT) | Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes (UMR Eco&Sols) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)
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Show more [+] Less [-]English. An alternative process is suggested, by means of surface area enlargement, in order to study the direct assimilation of natural phosphates (NP) and to avoid the liquid-solid states in the treatment. New pulverisation technologies have been used to grind natural phosphates: Ball crushers. The consequences of this grinding are shown in two characteristics: a physical one and chemical one-reactivity have been modified. The aim of this investigation is the development of three granulometric slices that is <160 μm, <80 μm and the fine slice <40μm. Different techniques are used to characterize the properties of the products after grinding. So we measured the distributions of the particles size by LASER and studied their morphologies with the scanning electronic microscopy (SEM). The characteristic temperatures of the products have been determined by (DTA/TGA). Finally, the final properties, like the properties of surface, have been characterized by BET. The crystalline nature of the powders has been determined by X-ray powder diffraction. The studied material is a sedimentary rock phosphate with three size fraction <160 μm, <80 μm and <40 μm. The specific surface fractions <160 μm, <80 μm and <40 μm are respectively 17.45 m²/g, 18.50 m²/g and 9 m²/g. The chemical analysis of the product suggests that the composition of apatite lends itself to the substitution groups PO43- by (CO3F)3-.
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